<?php

class Database {

	private $db;
	public $error;

	public function __construct($connect = false, $db = false){
		$this->db = new Redis();
		
		if ( ! $connect || ! $db )
			return;

		$this->connect($connect, $db);
	}
	
	public function connect($connect, $db){
		try {
			$this->db->connect($connect);
		} catch (Exception $e){
			$this->error = $e;
			return false;
		}

		try {
			$this->db->select($db);
		} catch (Exception $e){
			$this->error = $e;
			return false;
		}

		try {
			$this->db->ping();
		} catch (Exception $e){
			$this->error = $e;
			return false;
		}
		
		return true;
	}

	public function expire($key, $ttl){
		try {
			$this->db->setTimeout($key, $ttl);
		} catch (Exception $e){
			$this->error = $e;
			return false;
		}
	}

	public function set($key, $value, $ttl = null){
		if ( is_null($ttl) )
			return $this->db->set($key, $value);
		else
			return $this->db->set($key, $value, (int)$ttl);
	}

	public function get($key){
		return $this->db->get($key);
	}

	public function exists($key){
		return $this->db->exists($key);
	}

	public function __destruct(){
		try {
			$this->db->close();
		} catch (Exception $e){
			return false;
		}
	}
}